A search for solar flare positrons

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Abundance, Helium Isotopes, High Energy Interactions, Positrons, Solar Flares, X Ray Spectra, Deuterium, Gamma Rays, Nuclear Reactions, Solar Activity Effects, Solar Cosmic Rays, Solar X-Rays, Tritium

Scientific paper

The detection of solar gamma-ray line emission and observations of the isotopes H2, H-3, and He-3 in solar cosmic rays provide direct evidence for the occurrence of high energy nuclear reactions in solar flare events. Appreciable numbers of other reaction products, including positrons with energies near about 1 MeV, should also be produced in such events. We have searched for positrons in the 0.16-1.6 MeV energy interval during 5 H-3 rich solar particle events. Based on calculations of positron and He-3 production at the sun, and using a simplified model of interplanetary propagation, we might expect comparable fluences of positrons and He-3 to be observed. Summing over these 5 events, we find the 0.16 to 1.6 MeV positron fluence to be a maximum of about 10% of the He-3 fluence with more than 1 MeV/nuc. This suggests that other processes, such as preferential trapping by the solar magnetic field, may be important.

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